Geothermal energy
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  • 1. ● Geothermal energy is thermal energy generated and stored in the Earth. Thermal energy is the energy that determines the temperature of matter.
  • 2. ● The Geothermal energy of the Earths crust originates from the original formation of the planet (20%) and ROM radioactive decay of minerals (80%)
  • 3. ● The Earths geothermal resources are theoretically that adequate to supply humanitys energy needs, but may a small part be profitably exploited. Drilling and exploration for deep resources is very expensive.
  • 4. ● Geothermal energy can be used as an efficient heat source in small end-use applications such as greenhouses, but the consumers have to be located close to the source of heat.
  • 5. ● Geothermal energy - heat from the earth (in most cases mineral water)- is an important energy source having environmental and economic advantages over fossil and nuclear energy sources.
  • 6. ● Three different types of power plants - dry steam, flash, and binary - are used to generate electricity from geothermal energy, depending on temperature, depth, and quality of the water and steam in the area.
  • 7. Dry Steam Power Plants● A dry steam power plant uses dry steam, typically above 235°C (455°F), to directly power its turbines.
  • 8. ● Dry steam is steam that contains no water droplets. All of the molecules are in a gaseous, as opposed to liquid, state.
  • 9. Flash steam● Flash steam power plants use hot water above 182 °C (360 °F) from geothermal reservoirs. The high pressure underground keeps the water in the liquid state, although it is well above the boiling point of water at normal sea level atmospheric pressure.
  • 10. Binary-cycle● The water used in binary-cycle power plants is cooler than that of flash steam plants, from 107 to 182 °C (225-360 °F). The hot fluid from geothermal reservoirs is passed through a heat exchanger which transfers heat to a separate pipe containing fluids with a much lower boiling point.
  • 11. ADVANTAGE● Geothermal energy offers a number of advantages over traditional fossil fuel based sources.
  • 12. ● From an environmental standpoint, the energy harnessed is clean and safe for the environment.
  • 13. ● It is also sustainable because the hot water used in the geothermal process can be re- injected into the ground to produce more steam.
  • 14. Geothermal energy questionsGeothermal energy can also be used togenerate electricity TrueDrilling deep wells is very cheap FalseMagma heats underground water to theboillin point TrueThere are a lot of places where magmacomes close to Earths surface FalseGehotermal does have dinodrantages TrueIn some places, magma isnt very close tothe surface False
  • 15. Electricity in the most widely used fromenergy TrueThere arent twelve different un big powerstation FalseThe non-rewables are the three fossil fuelsand nuclear TrueBurning coal and oil relones dioxed wichdont causes acid rain FalsePetroleum is a renewable sorces of energy FalseThe renewables are: wind, waves, tides,hidroelectric, solar, gethermal, biomass True